211099993 has 4 divisors (see below), whose sum is σ = 227338468. Its totient is φ = 194861520.

The previous prime is 211099949. The next prime is 211100009. The reversal of 211099993 is 399990112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83229129 + 127870864 = 9123^2 + 11308^2 .

It is a cyclic number.

It is not a de Polignac number, because 211099993 - 2¹⁷ = 210968921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211099913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8119218 + ... + 8119243.

It is an arithmetic number, because the mean of its divisors is an integer number (56834617).

Almost surely, 2^211099993 is an apocalyptic number.

It is an amenable number.

211099993 is a deficient number, since it is larger than the sum of its proper divisors (16238475).

211099993 is a wasteful number, since it uses less digits than its factorization.

211099993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16238474.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 211099993 is about 14529.2805396551. The cubic root of 211099993 is about 595.4282095124.

The spelling of 211099993 in words is "two hundred eleven million, ninety-nine thousand, nine hundred ninety-three".